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1897 | serge | 1 | |
2 | * |
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3 | * For conditions of distribution and use, see copyright notice in png.h |
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4 | * Copyright (c) 1998-2011 Glenn Randers-Pehrson |
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5 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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6 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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7 | * |
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8 | * Last changed in libpng 1.5.0 [January 6, 2011] |
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9 | * |
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10 | * This code is released under the libpng license. |
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11 | * For conditions of distribution and use, see the disclaimer |
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12 | * and license in png.h |
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13 | */ |
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14 | |||
15 | |||
16 | * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public |
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17 | * interface, and are not recommended for use by regular applications. |
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18 | * Some of them may become public in the future; others may stay private, |
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19 | * change in an incompatible way, or even disappear. |
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20 | * Although the libpng users are not forbidden to include this header, |
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21 | * they should be well aware of the issues that may arise from doing so. |
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22 | */ |
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23 | |||
24 | |||
25 | #define PNGPRIV_H |
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26 | |||
27 | |||
28 | * error handler when all else fails. |
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29 | */ |
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30 | #include |
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31 | |||
32 | |||
33 | #ifdef PNG_USER_CONFIG |
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34 | # include "pngusr.h" |
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35 | /* These should have been defined in pngusr.h */ |
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36 | # ifndef PNG_USER_PRIVATEBUILD |
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37 | # define PNG_USER_PRIVATEBUILD "Custom libpng build" |
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38 | # endif |
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39 | # ifndef PNG_USER_DLLFNAME_POSTFIX |
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40 | # define PNG_USER_DLLFNAME_POSTFIX "Cb" |
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41 | # endif |
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42 | #endif |
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43 | #include "png.h" |
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44 | #include "pnginfo.h" |
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45 | #include "pngstruct.h" |
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46 | |||
47 | |||
48 | * this could be changed: |
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49 | */ |
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50 | typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; |
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51 | |||
52 | |||
53 | /* Moved to pngpriv.h at libpng-1.5.0 */ |
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54 | |||
55 | |||
56 | * script. We may need it here to get the correct configuration on things |
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57 | * like limits. |
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58 | */ |
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59 | #ifdef PNG_CONFIGURE_LIBPNG |
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60 | # ifdef HAVE_CONFIG_H |
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61 | # include "config.h" |
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62 | # endif |
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63 | #endif |
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64 | |||
65 | |||
66 | /* NOTE: some of these may have been used in external applications as |
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67 | * these definitions were exposed in pngconf.h prior to 1.5. |
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68 | */ |
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69 | |||
70 | |||
71 | * than 64K of memory at once, uncomment this. While libpng will not |
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72 | * normally need that much memory in a chunk (unless you load up a very |
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73 | * large file), zlib needs to know how big of a chunk it can use, and |
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74 | * libpng thus makes sure to check any memory allocation to verify it |
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75 | * will fit into memory. |
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76 | * |
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77 | * zlib provides 'MAXSEG_64K' which, if defined, indicates the |
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78 | * same limit and pngconf.h (already included) sets the limit |
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79 | * if certain operating systems are detected. |
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80 | */ |
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81 | #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) |
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82 | # define PNG_MAX_MALLOC_64K |
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83 | #endif |
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84 | |||
85 | |||
86 | * which is expected to have no bad effects on performance (optimizing |
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87 | * compilers will probably remove it entirely). Note that if you replace |
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88 | * it with something other than whitespace, you must include the terminating |
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89 | * semicolon. |
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90 | */ |
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91 | #define PNG_UNUSED(param) (void)param; |
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92 | |||
93 | |||
94 | * contradictory. |
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95 | */ |
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96 | #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) |
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97 | # undef PNG_ZBUF_SIZE |
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98 | # define PNG_ZBUF_SIZE 65536L |
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99 | #endif |
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100 | |||
101 | |||
102 | * or redirected here. |
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103 | */ |
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104 | #ifndef PNG_WARNINGS_SUPPORTED |
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105 | # define png_warning(s1,s2) ((void)0) |
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106 | # define png_chunk_warning(s1,s2) ((void)0) |
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107 | #endif |
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108 | #ifndef PNG_ERROR_TEXT_SUPPORTED |
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109 | # define png_error(s1,s2) png_err(s1) |
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110 | # define png_chunk_error(s1,s2) png_err(s1) |
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111 | # define png_fixed_error(s1,s2) png_err(s1) |
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112 | #endif |
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113 | |||
114 | |||
115 | /* The functions exported by PNG_EXTERN are internal functions, which |
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116 | * aren't usually used outside the library (as far as I know), so it is |
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117 | * debatable if they should be exported at all. In the future, when it |
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118 | * is possible to have run-time registry of chunk-handling functions, |
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119 | * some of these might be made available again. |
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120 | # define PNG_EXTERN extern |
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121 | */ |
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122 | # define PNG_EXTERN |
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123 | #endif |
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124 | |||
125 | |||
126 | * they get used by the corresponding floating point APIs. This magic |
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127 | * deals with this: |
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128 | */ |
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129 | #ifdef PNG_FIXED_POINT_SUPPORTED |
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130 | # define PNGFAPI PNGAPI |
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131 | #else |
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132 | # define PNGFAPI /* PRIVATE */ |
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133 | #endif |
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134 | |||
135 | |||
136 | * them inside an appropriate ifdef/endif pair for portability. |
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137 | */ |
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138 | #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ |
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139 | defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) |
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140 | /* png.c requires the following ANSI-C constants if the conversion of |
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141 | * floating point to ASCII is implemented therein: |
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142 | * |
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143 | * DBL_DIG Maximum number of decimal digits (can be set to any constant) |
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144 | * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) |
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145 | * DBL_MAX Maximum floating point number (can be set to an arbitrary value) |
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146 | */ |
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147 | # include |
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148 | |||
149 | |||
150 | defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) |
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151 | /* We need to check that |
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152 | * as it seems it doesn't agree with |
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153 | * |
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154 | */ |
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155 | # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) |
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156 | # include |
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157 | # endif |
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158 | # else |
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159 | # include |
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160 | # endif |
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161 | # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) |
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162 | /* Amiga SAS/C: We must include builtin FPU functions when compiling using |
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163 | * MATH=68881 |
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164 | */ |
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165 | # include |
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166 | # endif |
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167 | #endif |
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168 | |||
169 | |||
170 | #if defined(__TURBOC__) && defined(__MSDOS__) |
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171 | # include |
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172 | # include |
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173 | #endif |
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174 | |||
175 | |||
176 | |||
177 | /* Users may want to use these so they are not private. Any library |
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178 | * functions that are passed far data must be model-independent. |
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179 | */ |
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180 | |||
181 | |||
182 | #ifndef PNG_ABORT |
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183 | # ifdef _WINDOWS_ |
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184 | # define PNG_ABORT() ExitProcess(0) |
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185 | # else |
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186 | # define PNG_ABORT() abort() |
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187 | # endif |
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188 | #endif |
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189 | |||
190 | |||
191 | /* Use this to make far-to-near assignments */ |
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192 | # define CHECK 1 |
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193 | # define NOCHECK 0 |
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194 | # define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) |
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195 | # define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) |
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196 | # define png_strcpy _fstrcpy |
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197 | # define png_strncpy _fstrncpy /* Added to v 1.2.6 */ |
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198 | # define png_strlen _fstrlen |
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199 | # define png_memcmp _fmemcmp /* SJT: added */ |
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200 | # define png_memcpy _fmemcpy |
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201 | # define png_memset _fmemset |
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202 | # define png_sprintf sprintf |
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203 | #else |
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204 | # ifdef _WINDOWS_ /* Favor Windows over C runtime fns */ |
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205 | # define CVT_PTR(ptr) (ptr) |
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206 | # define CVT_PTR_NOCHECK(ptr) (ptr) |
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207 | # define png_strcpy lstrcpyA |
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208 | # define png_strncpy lstrcpynA |
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209 | # define png_strlen lstrlenA |
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210 | # define png_memcmp memcmp |
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211 | # define png_memcpy CopyMemory |
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212 | # define png_memset memset |
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213 | # define png_sprintf wsprintfA |
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214 | # else |
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215 | # define CVT_PTR(ptr) (ptr) |
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216 | # define CVT_PTR_NOCHECK(ptr) (ptr) |
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217 | # define png_strcpy strcpy |
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218 | # define png_strncpy strncpy /* Added to v 1.2.6 */ |
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219 | # define png_strlen strlen |
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220 | # define png_memcmp memcmp /* SJT: added */ |
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221 | # define png_memcpy memcpy |
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222 | # define png_memset memset |
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223 | # define png_sprintf sprintf |
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224 | # endif |
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225 | #endif |
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226 | /* End of memory model/platform independent support */ |
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227 | |||
228 | |||
229 | # ifdef _MSC_VER |
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230 | # define png_snprintf _snprintf /* Added to v 1.2.19 */ |
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231 | # define png_snprintf2 _snprintf |
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232 | # define png_snprintf6 _snprintf |
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233 | # else |
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234 | # define png_snprintf snprintf /* Added to v 1.2.19 */ |
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235 | # define png_snprintf2 snprintf |
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236 | # define png_snprintf6 snprintf |
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237 | # endif |
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238 | #else |
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239 | /* You don't have or don't want to use snprintf(). Caution: Using |
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240 | * sprintf instead of snprintf exposes your application to accidental |
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241 | * or malevolent buffer overflows. If you don't have snprintf() |
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242 | * as a general rule you should provide one (you can get one from |
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243 | * Portable OpenSSH). |
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244 | */ |
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245 | # define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1) |
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246 | # define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2) |
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247 | # define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \ |
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248 | png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6) |
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249 | #endif |
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250 | /* End of 1.5.0beta36 move from pngconf.h */ |
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251 | |||
252 | |||
253 | * These are used internally by libpng and not exposed in the API |
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254 | */ |
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255 | |||
256 | |||
257 | * zero automatically when the structure is created. |
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258 | */ |
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259 | #define PNG_HAVE_IHDR 0x01 |
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260 | #define PNG_HAVE_PLTE 0x02 |
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261 | #define PNG_HAVE_IDAT 0x04 |
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262 | #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ |
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263 | #define PNG_HAVE_IEND 0x10 |
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264 | #define PNG_HAVE_gAMA 0x20 |
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265 | #define PNG_HAVE_cHRM 0x40 |
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266 | #define PNG_HAVE_sRGB 0x80 |
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267 | #define PNG_HAVE_CHUNK_HEADER 0x100 |
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268 | #define PNG_WROTE_tIME 0x200 |
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269 | #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
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270 | #define PNG_BACKGROUND_IS_GRAY 0x800 |
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271 | #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
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272 | #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
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273 | |||
274 | |||
275 | #define PNG_BGR 0x0001 |
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276 | #define PNG_INTERLACE 0x0002 |
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277 | #define PNG_PACK 0x0004 |
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278 | #define PNG_SHIFT 0x0008 |
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279 | #define PNG_SWAP_BYTES 0x0010 |
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280 | #define PNG_INVERT_MONO 0x0020 |
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281 | #define PNG_QUANTIZE 0x0040 |
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282 | #define PNG_BACKGROUND 0x0080 |
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283 | #define PNG_BACKGROUND_EXPAND 0x0100 |
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284 | /* 0x0200 unused */ |
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285 | #define PNG_16_TO_8 0x0400 |
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286 | #define PNG_RGBA 0x0800 |
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287 | #define PNG_EXPAND 0x1000 |
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288 | #define PNG_GAMMA 0x2000 |
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289 | #define PNG_GRAY_TO_RGB 0x4000 |
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290 | #define PNG_FILLER 0x8000L |
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291 | #define PNG_PACKSWAP 0x10000L |
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292 | #define PNG_SWAP_ALPHA 0x20000L |
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293 | #define PNG_STRIP_ALPHA 0x40000L |
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294 | #define PNG_INVERT_ALPHA 0x80000L |
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295 | #define PNG_USER_TRANSFORM 0x100000L |
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296 | #define PNG_RGB_TO_GRAY_ERR 0x200000L |
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297 | #define PNG_RGB_TO_GRAY_WARN 0x400000L |
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298 | #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ |
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299 | /* 0x800000L Unused */ |
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300 | #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ |
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301 | #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ |
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302 | /* 0x4000000L unused */ |
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303 | /* 0x8000000L unused */ |
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304 | /* 0x10000000L unused */ |
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305 | /* 0x20000000L unused */ |
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306 | /* 0x40000000L unused */ |
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307 | |||
308 | |||
309 | #define PNG_STRUCT_PNG 0x0001 |
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310 | #define PNG_STRUCT_INFO 0x0002 |
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311 | |||
312 | |||
313 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
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314 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
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315 | |||
316 | |||
317 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
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318 | #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
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319 | #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
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320 | #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
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321 | #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
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322 | #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
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323 | #define PNG_FLAG_ROW_INIT 0x0040 |
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324 | #define PNG_FLAG_FILLER_AFTER 0x0080 |
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325 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
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326 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
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327 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
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328 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
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329 | /* 0x1000 unused */ |
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330 | /* 0x2000 unused */ |
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331 | /* 0x4000 unused */ |
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332 | #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L |
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333 | #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L |
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334 | #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L |
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335 | #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L |
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336 | #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L |
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337 | #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L |
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338 | #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ |
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339 | #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ |
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340 | #define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */ |
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341 | /* 0x1000000L unused */ |
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342 | /* 0x2000000L unused */ |
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343 | /* 0x4000000L unused */ |
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344 | /* 0x8000000L unused */ |
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345 | /* 0x10000000L unused */ |
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346 | /* 0x20000000L unused */ |
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347 | /* 0x40000000L unused */ |
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348 | |||
349 | |||
350 | PNG_FLAG_CRC_ANCILLARY_NOWARN) |
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351 | |||
352 | |||
353 | PNG_FLAG_CRC_CRITICAL_IGNORE) |
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354 | |||
355 | |||
356 | PNG_FLAG_CRC_CRITICAL_MASK) |
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357 | |||
358 | |||
359 | * can handle at once. This type need be no larger than 16 bits (so maximum of |
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360 | * 65535), this define allows us to discover how big it is, but limited by the |
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361 | * maximuum for png_size_t. The value can be overriden in a library build |
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362 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
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363 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
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364 | * and may even improve performance on some systems (and degrade it on others.) |
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365 | */ |
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366 | #ifndef ZLIB_IO_MAX |
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367 | # define ZLIB_IO_MAX ((uInt)-1) |
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368 | #endif |
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369 | |||
370 | |||
371 | |||
372 | |||
373 | abs((int)((c1).green) - (int)((c2).green)) + \ |
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374 | abs((int)((c1).blue) - (int)((c2).blue))) |
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375 | |||
376 | |||
377 | #define PNG_ROWBYTES(pixel_bits, width) \ |
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378 | ((pixel_bits) >= 8 ? \ |
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379 | ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ |
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380 | (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) |
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381 | |||
382 | |||
383 | * ideal-delta..ideal+delta. Each argument is evaluated twice. |
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384 | * "ideal" and "delta" should be constants, normally simple |
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385 | * integers, "value" a variable. Added to libpng-1.2.6 JB |
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386 | */ |
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387 | #define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
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388 | ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
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389 | |||
390 | |||
391 | * required (to make sure the code doesn't accidentally use float |
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392 | * when it is supposedly disabled.) |
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393 | */ |
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394 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
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395 | /* The floating point conversion can't overflow, though it can and |
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396 | * does lose accuracy relative to the original fixed point value. |
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397 | * In practice this doesn't matter because png_fixed_point only |
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398 | * stores numbers with very low precision. The png_ptr and s |
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399 | * arguments are unused by default but are there in case error |
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400 | * checking becomes a requirement. |
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401 | */ |
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402 | #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) |
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403 | |||
404 | |||
405 | * its argument multiple times, so must be used with care. The |
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406 | * range checking uses the PNG specification values for a signed |
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407 | * 32 bit fixed point value except that the values are deliberately |
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408 | * rounded-to-zero to an integral value - 21474 (21474.83 is roughly |
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409 | * (2^31-1) * 100000). 's' is a string that describes the value being |
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410 | * converted. |
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411 | * |
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412 | * NOTE: this macro will raise a png_error if the range check fails, |
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413 | * therefore it is normally only appropriate to use this on values |
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414 | * that come from API calls or other sources where an out of range |
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415 | * error indicates a programming error, not a data error! |
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416 | * |
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417 | * NOTE: by default this is off - the macro is not used - because the |
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418 | * function call saves a lot of code. |
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419 | */ |
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420 | #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED |
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421 | #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ |
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422 | ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) |
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423 | #else |
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424 | PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp, |
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425 | png_const_charp text)); |
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426 | #endif |
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427 | #endif |
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428 | |||
429 | |||
430 | * define the name here, and add an invocation of the macro wherever it's |
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431 | * needed. |
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432 | */ |
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433 | #define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} |
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434 | #define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} |
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435 | #define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} |
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436 | #define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} |
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437 | #define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} |
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438 | #define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} |
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439 | #define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} |
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440 | #define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} |
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441 | #define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} |
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442 | #define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} |
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443 | #define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} |
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444 | #define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} |
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445 | #define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} |
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446 | #define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} |
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447 | #define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} |
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448 | #define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} |
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449 | #define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} |
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450 | #define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'} |
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451 | #define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} |
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452 | #define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} |
||
453 | #define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} |
||
454 | #define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} |
||
455 | |||
456 | |||
457 | |||
458 | #ifdef __cplusplus |
||
459 | extern "C" { |
||
460 | #endif /* __cplusplus */ |
||
461 | |||
462 | |||
463 | * shouldn't be used unless you are writing code to add or replace some |
||
464 | * functionality in libpng. More information about most functions can |
||
465 | * be found in the files where the functions are located. |
||
466 | */ |
||
467 | |||
468 | |||
469 | PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), |
||
470 | PNG_ALLOCATED); |
||
471 | |||
472 | |||
473 | PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
||
474 | |||
475 | |||
476 | PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)), |
||
477 | PNG_ALLOCATED); |
||
478 | PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
||
479 | png_free_ptr free_fn, png_voidp mem_ptr)); |
||
480 | |||
481 | |||
482 | PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
||
483 | png_infop info_ptr)); |
||
484 | |||
485 | |||
486 | PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items, |
||
487 | uInt size)),PNG_ALLOCATED); |
||
488 | |||
489 | |||
490 | PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
||
491 | |||
492 | |||
493 | * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to |
||
494 | * PNGCBAPI at 1.5.0 |
||
495 | */ |
||
496 | |||
497 | |||
498 | png_bytep data, png_size_t length)); |
||
499 | |||
500 | |||
501 | PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr, |
||
502 | png_bytep buffer, png_size_t length)); |
||
503 | #endif |
||
504 | |||
505 | |||
506 | png_bytep data, png_size_t length)); |
||
507 | |||
508 | |||
509 | # ifdef PNG_STDIO_SUPPORTED |
||
510 | PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr)); |
||
511 | # endif |
||
512 | #endif |
||
513 | |||
514 | |||
515 | PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
||
516 | |||
517 | |||
518 | PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, |
||
519 | png_const_bytep data, png_size_t length)); |
||
520 | |||
521 | |||
522 | PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr)); |
||
523 | |||
524 | |||
525 | PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); |
||
526 | |||
527 | |||
528 | PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
||
529 | png_size_t length)); |
||
530 | |||
531 | |||
532 | PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
||
533 | png_size_t length)); |
||
534 | |||
535 | |||
536 | #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ |
||
537 | defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) |
||
538 | PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, |
||
539 | int comp_type, png_size_t chunklength, png_size_t prefix_length, |
||
540 | png_size_t *data_length)); |
||
541 | #endif |
||
542 | |||
543 | |||
544 | PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
||
545 | |||
546 | |||
547 | PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
||
548 | |||
549 | |||
550 | * passing a maximum of 64K on systems that have this as a memory limit, |
||
551 | * since this is the maximum buffer size we can specify. |
||
552 | */ |
||
553 | PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, |
||
554 | png_const_bytep ptr, png_size_t length)); |
||
555 | |||
556 | |||
557 | PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
||
558 | #endif |
||
559 | |||
560 | |||
561 | |||
562 | |||
563 | * information. |
||
564 | */ |
||
565 | PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
||
566 | png_uint_32 height, |
||
567 | int bit_depth, int color_type, int compression_method, int filter_method, |
||
568 | int interlace_method)); |
||
569 | |||
570 | |||
571 | png_const_colorp palette, png_uint_32 num_pal)); |
||
572 | |||
573 | |||
574 | png_size_t length)); |
||
575 | |||
576 | |||
577 | |||
578 | |||
579 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
||
580 | PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
||
581 | # endif |
||
582 | # ifdef PNG_FIXED_POINT_SUPPORTED |
||
583 | PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, |
||
584 | png_fixed_point file_gamma)); |
||
585 | # endif |
||
586 | #endif |
||
587 | |||
588 | |||
589 | PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, |
||
590 | png_const_color_8p sbit, int color_type)); |
||
591 | #endif |
||
592 | |||
593 | |||
594 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
||
595 | PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
||
596 | double white_x, double white_y, |
||
597 | double red_x, double red_y, double green_x, double green_y, |
||
598 | double blue_x, double blue_y)); |
||
599 | # endif |
||
600 | PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
||
601 | png_fixed_point int_white_x, png_fixed_point int_white_y, |
||
602 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
||
603 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
||
604 | png_fixed_point int_blue_y)); |
||
605 | #endif |
||
606 | |||
607 | |||
608 | PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
||
609 | int intent)); |
||
610 | #endif |
||
611 | |||
612 | |||
613 | PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
||
614 | png_const_charp name, int compression_type, |
||
615 | png_const_charp profile, int proflen)); |
||
616 | /* Note to maintainer: profile should be png_bytep */ |
||
617 | #endif |
||
618 | |||
619 | |||
620 | PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
||
621 | png_const_sPLT_tp palette)); |
||
622 | #endif |
||
623 | |||
624 | |||
625 | PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, |
||
626 | png_const_bytep trans, png_const_color_16p values, int number, |
||
627 | int color_type)); |
||
628 | #endif |
||
629 | |||
630 | |||
631 | PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
||
632 | png_const_color_16p values, int color_type)); |
||
633 | #endif |
||
634 | |||
635 | |||
636 | PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, |
||
637 | png_const_uint_16p hist, int num_hist)); |
||
638 | #endif |
||
639 | |||
640 | |||
641 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
||
642 | PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
||
643 | png_const_charp key, png_charpp new_key)); |
||
644 | #endif |
||
645 | |||
646 | |||
647 | PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key, |
||
648 | png_const_charp text, png_size_t text_len)); |
||
649 | #endif |
||
650 | |||
651 | |||
652 | PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key, |
||
653 | png_const_charp text, png_size_t text_len, int compression)); |
||
654 | #endif |
||
655 | |||
656 | |||
657 | PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
||
658 | int compression, png_const_charp key, png_const_charp lang, |
||
659 | png_const_charp lang_key, png_const_charp text)); |
||
660 | #endif |
||
661 | |||
662 | |||
663 | PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, |
||
664 | png_infop info_ptr, png_const_textp text_ptr, int num_text)); |
||
665 | #endif |
||
666 | |||
667 | |||
668 | PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
||
669 | png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
||
670 | #endif |
||
671 | |||
672 | |||
673 | PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
||
674 | png_int_32 X0, png_int_32 X1, int type, int nparams, |
||
675 | png_const_charp units, png_charpp params)); |
||
676 | #endif |
||
677 | |||
678 | |||
679 | PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
||
680 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
||
681 | int unit_type)); |
||
682 | #endif |
||
683 | |||
684 | |||
685 | PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
||
686 | png_const_timep mod_time)); |
||
687 | #endif |
||
688 | |||
689 | |||
690 | PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
||
691 | int unit, png_const_charp width, png_const_charp height)); |
||
692 | #endif |
||
693 | |||
694 | |||
695 | PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
||
696 | |||
697 | |||
698 | PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
||
699 | |||
700 | |||
701 | PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
||
702 | int mask)); |
||
703 | |||
704 | |||
705 | /* Expand an interlaced row */ |
||
706 | /* OLD pre-1.0.9 interface: |
||
707 | PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
||
708 | png_bytep row, int pass, png_uint_32 transformations)); |
||
709 | */ |
||
710 | PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); |
||
711 | #endif |
||
712 | |||
713 | |||
714 | |||
715 | |||
716 | /* Grab pixels out of a row for an interlaced pass */ |
||
717 | PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
||
718 | png_bytep row, int pass)); |
||
719 | #endif |
||
720 | |||
721 | |||
722 | PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
||
723 | png_row_infop row_info, png_bytep row, png_const_bytep prev_row, |
||
724 | int filter)); |
||
725 | |||
726 | |||
727 | PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
||
728 | png_row_infop row_info)); |
||
729 | |||
730 | |||
731 | PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
||
732 | png_bytep filtered_row)); |
||
733 | /* Finish a row while reading, dealing with interlacing passes, etc. */ |
||
734 | PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
||
735 | |||
736 | |||
737 | PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
||
738 | /* Optional call to update the users info structure */ |
||
739 | PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
||
740 | png_infop info_ptr)); |
||
741 | |||
742 | |||
743 | #ifdef PNG_READ_FILLER_SUPPORTED |
||
744 | PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
||
745 | png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
||
746 | #endif |
||
747 | |||
748 | |||
749 | PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
||
750 | png_bytep row)); |
||
751 | #endif |
||
752 | |||
753 | |||
754 | PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
||
755 | png_bytep row)); |
||
756 | #endif |
||
757 | |||
758 | |||
759 | PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
||
760 | png_bytep row)); |
||
761 | #endif |
||
762 | |||
763 | |||
764 | PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
||
765 | png_bytep row)); |
||
766 | #endif |
||
767 | |||
768 | |||
769 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
||
770 | PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
||
771 | png_bytep row, png_uint_32 flags)); |
||
772 | #endif |
||
773 | |||
774 | |||
775 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
||
776 | PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, |
||
777 | png_bytep row)); |
||
778 | #endif |
||
779 | #endif |
||
780 | |||
781 | |||
782 | defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
||
783 | PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, |
||
784 | png_bytep row)); |
||
785 | #endif |
||
786 | |||
787 | |||
788 | PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, |
||
789 | png_row_infop row_info, png_bytep row)); |
||
790 | #endif |
||
791 | |||
792 | |||
793 | PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
||
794 | png_bytep row)); |
||
795 | #endif |
||
796 | |||
797 | |||
798 | PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, |
||
799 | png_bytep row)); |
||
800 | #endif |
||
801 | |||
802 | |||
803 | PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, |
||
804 | png_bytep row, png_const_color_8p sig_bits)); |
||
805 | #endif |
||
806 | |||
807 | |||
808 | PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, |
||
809 | png_bytep row)); |
||
810 | #endif |
||
811 | |||
812 | |||
813 | PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, |
||
814 | png_bytep row)); |
||
815 | #endif |
||
816 | |||
817 | |||
818 | PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info, |
||
819 | png_bytep row, png_const_bytep palette_lookup, |
||
820 | png_const_bytep quantize_lookup)); |
||
821 | |||
822 | |||
823 | PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
||
824 | png_colorp palette, int num_palette)); |
||
825 | # endif |
||
826 | #endif |
||
827 | |||
828 | |||
829 | PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, |
||
830 | png_bytep row)); |
||
831 | #endif |
||
832 | |||
833 | |||
834 | PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
||
835 | png_bytep row, png_uint_32 bit_depth)); |
||
836 | #endif |
||
837 | |||
838 | |||
839 | PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, |
||
840 | png_bytep row, png_const_color_8p bit_depth)); |
||
841 | #endif |
||
842 | |||
843 | |||
844 | # ifdef PNG_READ_GAMMA_SUPPORTED |
||
845 | PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, |
||
846 | png_bytep row, png_const_color_16p trans_color, |
||
847 | png_const_color_16p background, png_const_color_16p background_1, |
||
848 | png_const_bytep gamma_table, png_const_bytep gamma_from_1, |
||
849 | png_const_bytep gamma_to_1, png_const_uint_16pp gamma_16, |
||
850 | png_const_uint_16pp gamma_16_from_1, png_const_uint_16pp gamma_16_to_1, |
||
851 | int gamma_shift)); |
||
852 | # else |
||
853 | PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, |
||
854 | png_bytep row, png_const_color_16p trans_color, |
||
855 | png_const_color_16p background)); |
||
856 | # endif |
||
857 | #endif |
||
858 | |||
859 | |||
860 | PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, |
||
861 | png_bytep row, png_const_bytep gamma_table, |
||
862 | png_const_uint_16pp gamma_16_table, int gamma_shift)); |
||
863 | #endif |
||
864 | |||
865 | |||
866 | PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
||
867 | png_bytep row, png_const_colorp palette, png_const_bytep trans, |
||
868 | int num_trans)); |
||
869 | PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
||
870 | png_bytep row, png_const_color_16p trans_color)); |
||
871 | #endif |
||
872 | |||
873 | |||
874 | * then calls the appropriate callback for the chunk if it is valid. |
||
875 | */ |
||
876 | |||
877 | |||
878 | PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
879 | png_uint_32 length)); |
||
880 | PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
881 | png_uint_32 length)); |
||
882 | PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
883 | png_uint_32 length)); |
||
884 | |||
885 | |||
886 | PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
887 | png_uint_32 length)); |
||
888 | #endif |
||
889 | |||
890 | |||
891 | PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
892 | png_uint_32 length)); |
||
893 | #endif |
||
894 | |||
895 | |||
896 | PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
897 | png_uint_32 length)); |
||
898 | #endif |
||
899 | |||
900 | |||
901 | PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
902 | png_uint_32 length)); |
||
903 | #endif |
||
904 | |||
905 | |||
906 | PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
907 | png_uint_32 length)); |
||
908 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
||
909 | |||
910 | |||
911 | PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
912 | png_uint_32 length)); |
||
913 | #endif |
||
914 | |||
915 | |||
916 | PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
917 | png_uint_32 length)); |
||
918 | #endif |
||
919 | |||
920 | |||
921 | PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
922 | png_uint_32 length)); |
||
923 | #endif |
||
924 | |||
925 | |||
926 | PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
927 | png_uint_32 length)); |
||
928 | #endif |
||
929 | |||
930 | |||
931 | PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
932 | png_uint_32 length)); |
||
933 | #endif |
||
934 | |||
935 | |||
936 | PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
937 | png_uint_32 length)); |
||
938 | #endif |
||
939 | |||
940 | |||
941 | PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
942 | png_uint_32 length)); |
||
943 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
||
944 | |||
945 | |||
946 | PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
947 | png_uint_32 length)); |
||
948 | #endif |
||
949 | |||
950 | |||
951 | PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
952 | png_uint_32 length)); |
||
953 | #endif |
||
954 | |||
955 | |||
956 | PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
957 | png_uint_32 length)); |
||
958 | #endif |
||
959 | |||
960 | |||
961 | PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
962 | png_uint_32 length)); |
||
963 | #endif |
||
964 | |||
965 | |||
966 | PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
||
967 | png_uint_32 length)); |
||
968 | #endif |
||
969 | |||
970 | |||
971 | png_infop info_ptr, png_uint_32 length)); |
||
972 | |||
973 | |||
974 | png_const_bytep chunk_name)); |
||
975 | |||
976 | |||
977 | PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
||
978 | PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
||
979 | |||
980 | |||
981 | |||
982 | |||
983 | PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
||
984 | png_infop info_ptr)); |
||
985 | PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
||
986 | png_infop info_ptr)); |
||
987 | PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
||
988 | PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
||
989 | png_uint_32 length)); |
||
990 | PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
||
991 | PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
||
992 | PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
||
993 | png_bytep buffer, png_size_t buffer_length)); |
||
994 | PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
||
995 | PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
||
996 | png_bytep buffer, png_size_t buffer_length)); |
||
997 | PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
||
998 | PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
||
999 | png_infop info_ptr, png_uint_32 length)); |
||
1000 | PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
||
1001 | png_infop info_ptr)); |
||
1002 | PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
||
1003 | png_infop info_ptr)); |
||
1004 | PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
||
1005 | PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
||
1006 | png_infop info_ptr)); |
||
1007 | PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
||
1008 | png_infop info_ptr)); |
||
1009 | PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
||
1010 | # ifdef PNG_READ_tEXt_SUPPORTED |
||
1011 | PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
||
1012 | png_infop info_ptr, png_uint_32 length)); |
||
1013 | PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
||
1014 | png_infop info_ptr)); |
||
1015 | # endif |
||
1016 | # ifdef PNG_READ_zTXt_SUPPORTED |
||
1017 | PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
||
1018 | png_infop info_ptr, png_uint_32 length)); |
||
1019 | PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
||
1020 | png_infop info_ptr)); |
||
1021 | # endif |
||
1022 | # ifdef PNG_READ_iTXt_SUPPORTED |
||
1023 | PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
||
1024 | png_infop info_ptr, png_uint_32 length)); |
||
1025 | PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
||
1026 | png_infop info_ptr)); |
||
1027 | # endif |
||
1028 | |||
1029 | |||
1030 | |||
1031 | |||
1032 | PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
||
1033 | png_bytep row)); |
||
1034 | PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
||
1035 | png_bytep row)); |
||
1036 | #endif |
||
1037 | |||
1038 | |||
1039 | #ifdef PNG_CHECK_cHRM_SUPPORTED |
||
1040 | PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, |
||
1041 | png_fixed_point int_white_x, png_fixed_point int_white_y, |
||
1042 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
||
1043 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
||
1044 | png_fixed_point int_blue_y)); |
||
1045 | #endif |
||
1046 | |||
1047 | |||
1048 | /* Added at libpng version 1.2.34 and 1.4.0 */ |
||
1049 | /* Currently only used by png_check_cHRM_fixed */ |
||
1050 | PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, |
||
1051 | unsigned long *hi_product, unsigned long *lo_product)); |
||
1052 | #endif |
||
1053 | |||
1054 | |||
1055 | PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, |
||
1056 | png_uint_32 width, png_uint_32 height, int bit_depth, |
||
1057 | int color_type, int interlace_type, int compression_type, |
||
1058 | int filter_type)); |
||
1059 | |||
1060 | |||
1061 | PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, |
||
1062 | png_infop info_ptr, png_infop end_info_ptr)); |
||
1063 | |||
1064 | |||
1065 | PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr)); |
||
1066 | |||
1067 | |||
1068 | PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr, |
||
1069 | int check)); |
||
1070 | #endif /* USE_FAR_KEYWORD */ |
||
1071 | |||
1072 | |||
1073 | PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr, |
||
1074 | png_const_charp name),PNG_NORETURN); |
||
1075 | #endif |
||
1076 | |||
1077 | |||
1078 | * support is required. |
||
1079 | */ |
||
1080 | #if defined(PNG_READ_sCAL_SUPPORTED) |
||
1081 | /* MAX_DIGITS is actually the maximum number of characters in an sCAL |
||
1082 | * width or height, derived from the precision (number of significant |
||
1083 | * digits - a build time settable option) and assumpitions about the |
||
1084 | * maximum ridiculous exponent. |
||
1085 | */ |
||
1086 | #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) |
||
1087 | |||
1088 | |||
1089 | PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii, |
||
1090 | png_size_t size, double fp, unsigned int precision)); |
||
1091 | #endif /* FLOATING_POINT */ |
||
1092 | |||
1093 | |||
1094 | PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, |
||
1095 | png_charp ascii, png_size_t size, png_fixed_point fp)); |
||
1096 | #endif /* FIXED_POINT */ |
||
1097 | #endif /* READ_sCAL */ |
||
1098 | |||
1099 | |||
1100 | /* An internal API to validate the format of a floating point number. |
||
1101 | * The result is the index of the next character. If the number is |
||
1102 | * not valid it will be the index of a character in the supposed number. |
||
1103 | * |
||
1104 | * The format of a number is defined in the PNG extensions specification |
||
1105 | * and this API is strictly conformant to that spec, not anyone elses! |
||
1106 | * |
||
1107 | * The format as a regular expression is: |
||
1108 | * |
||
1109 | * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? |
||
1110 | * |
||
1111 | * or: |
||
1112 | * |
||
1113 | * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? |
||
1114 | * |
||
1115 | * The complexity is that either integer or fraction must be present and the |
||
1116 | * fraction is permitted to have no digits only if the integer is present. |
||
1117 | * |
||
1118 | * NOTE: The dangling E problem. |
||
1119 | * There is a PNG valid floating point number in the following: |
||
1120 | * |
||
1121 | * PNG floating point numb1.ers are not greedy. |
||
1122 | * |
||
1123 | * Working this out requires *TWO* character lookahead (because of the |
||
1124 | * sign), the parser does not do this - it will fail at the 'r' - this |
||
1125 | * doesn't matter for PNG sCAL chunk values, but it requires more care |
||
1126 | * if the value were ever to be embedded in something more complex. Use |
||
1127 | * ANSI-C strtod if you need the lookahead. |
||
1128 | */ |
||
1129 | /* State table for the parser. */ |
||
1130 | #define PNG_FP_INTEGER 0 /* before or in integer */ |
||
1131 | #define PNG_FP_FRACTION 1 /* before or in fraction */ |
||
1132 | #define PNG_FP_EXPONENT 2 /* before or in exponent */ |
||
1133 | #define PNG_FP_STATE 3 /* mask for the above */ |
||
1134 | #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ |
||
1135 | #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ |
||
1136 | #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ |
||
1137 | #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ |
||
1138 | #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ |
||
1139 | #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ |
||
1140 | #define PNG_FP_INVALID 128 /* Available for callers as a distinct value */ |
||
1141 | |||
1142 | |||
1143 | * not ok yet.) |
||
1144 | */ |
||
1145 | #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ |
||
1146 | #define PNG_FP_OK 1 /* The number is valid */ |
||
1147 | |||
1148 | |||
1149 | * the index into the string and the state variable (which must |
||
1150 | * be initialzed to 0). It returns a result code, as above. There |
||
1151 | * is no point calling the parser any more if it fails to advance to |
||
1152 | * the end of the string - it is stuck on an invalid character (or |
||
1153 | * terminated by '\0'). |
||
1154 | * |
||
1155 | * Note that the pointer will consume an E or even an E+ then leave |
||
1156 | * a 'maybe' state even though a preceding integer.fraction is valid. |
||
1157 | * The PNG_FP_WAS_VALID flag indicates that a preceding substring was |
||
1158 | * a valid number. It's possible to recover from this by calling |
||
1159 | * the parser again (from the start, with state 0) but with a string |
||
1160 | * that omits the last character (i.e. set the size to the index of |
||
1161 | * the problem character.) This has not been tested within libpng. |
||
1162 | */ |
||
1163 | PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string, |
||
1164 | png_size_t size, int *statep, png_size_tp whereami)); |
||
1165 | |||
1166 | |||
1167 | * only if it just contains a floating point number. |
||
1168 | */ |
||
1169 | PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, |
||
1170 | png_size_t size)); |
||
1171 | #endif /* pCAL || sCAL */ |
||
1172 | |||
1173 | |||
1174 | defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) |
||
1175 | /* Added at libpng version 1.5.0 */ |
||
1176 | /* This is a utility to provide a*times/div (rounded) and indicate |
||
1177 | * if there is an overflow. The result is a boolean - false (0) |
||
1178 | * for overflow, true (1) if no overflow, in which case *res |
||
1179 | * holds the result. |
||
1180 | */ |
||
1181 | PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a, |
||
1182 | png_int_32 times, png_int_32 div)); |
||
1183 | #endif |
||
1184 | |||
1185 | |||
1186 | /* Same deal, but issue a warning on overflow and return 0. */ |
||
1187 | PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr, |
||
1188 | png_fixed_point a, png_int_32 times, png_int_32 div)); |
||
1189 | #endif |
||
1190 | |||
1191 | |||
1192 | /* Calculate a reciprocal - used for gamma values. This returns |
||
1193 | * 0 if the argument is 0 in order to maintain an undefined value, |
||
1194 | * there are no warnings. |
||
1195 | */ |
||
1196 | PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a)); |
||
1197 | |||
1198 | |||
1199 | * values. Accuracy is suitable for gamma calculations but this is |
||
1200 | * not exact - use png_muldiv for that. |
||
1201 | */ |
||
1202 | PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a, |
||
1203 | png_fixed_point b)); |
||
1204 | #endif |
||
1205 | |||
1206 | |||
1207 | /* Internal fixed point gamma correction. These APIs are called as |
||
1208 | * required to convert single values - they don't need to be fast, |
||
1209 | * they are not used when processing image pixel values. |
||
1210 | * |
||
1211 | * While the input is an 'unsigned' value it must actually be the |
||
1212 | * correct bit value - 0..255 or 0..65535 as required. |
||
1213 | */ |
||
1214 | PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr, |
||
1215 | unsigned int value, png_fixed_point gamma)); |
||
1216 | PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma)); |
||
1217 | PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value, |
||
1218 | png_fixed_point gamma)); |
||
1219 | PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value, |
||
1220 | png_fixed_point gamma)); |
||
1221 | PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, |
||
1222 | int bit_depth)); |
||
1223 | #endif |
||
1224 | |||
1225 | |||
1226 | |||
1227 | |||
1228 | |||
1229 | |||
1230 | |||
1231 | } |
||
1232 | #endif |
||
1233 | |||
1234 | |||
1235 |